Suko (PuzzleMadness)

About Suko (PuzzleMadness)

Suko is a small number puzzle on a 3x3 grid. Each of the digits 1 to 9 goes in once. Four circles sit where four squares meet, and each circle's number is the sum of those four squares. The squares are also split into three colours, and the totals above the grid say what each colour group adds up to. The site notes that Suko is a trademark of Kobayaashi Studios.

The daily page opens today's puzzle on its own, and its title carries the date (on 3 October 2026 it read "Daily Medium Suko Puzzle for Saturday 3rd October 2026 (Medium)"). There is a separate dated puzzle for each difficulty: Easy, Medium, Hard and Mixed. Past days stay in the archive, so a missed puzzle can be played later, and there is a print version and an image download of the grid. PuzzleMadness does not publish solutions: the site tells you when you have finished a grid correctly or made a mistake. Each completed puzzle adds to your total on the Suko monthly and all-time leaderboards, where only your best score on any one puzzle counts.

With only nine squares, Suko is quick, but it is pure arithmetic logic. The centre square is in all four quadrants, and the edge squares in two each, so comparing quadrant sums tells you differences between squares. Colour groups of two squares often have only a few possible pairs.

PuzzleMadness is a British puzzle site with dozens of daily puzzle types in the browser, from many sudoku variants to logic grids such as Nurikabe, Hashi and Slitherlink. It is free to play and carries ads. A free account keeps track of the puzzles you have finished and puts your name on the leaderboards, and the badges next to usernames mark how many puzzles a player has completed.

How to play Suko (PuzzleMadness)

1. Open the day's Suko page and choose Easy, Medium, Hard or Mixed.
2. Read the four quadrant sums and the three colour totals.
3. Place 1 to 9 once each so every circle equals the sum of its four squares.
4. Make each colour group add up to its total; the site marks the grid solved.

Screenshots

Tips

• The four quadrant sums together count the centre four times and the edge squares twice.
• Subtract two quadrant sums that share two squares to compare the squares they do not share.
• A two-square colour group with a small total has few pairs to try.

Questions